A South African lawyer has said he was preparing a class action lawsuit against leading gold mining firms on behalf of thousands of former miners who say they contracted silicosis, a debilitating lung disease, through negligent health and safety. Attorney Richard Spoor, whose legal battle against a South African asbestos-mining company led to a $100m settlement in 2003, said he would file class action papers with the South Gauteng High Court in Johannesburg 'within the next few months'.